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Upper leaf necrosis on Lilium cv. St...

Chang, Yao-Chien.

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Upper leaf necrosis on Lilium cv. Star Gazer: A calcium deficiency disorder.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Upper leaf necrosis on Lilium cv. Star Gazer: A calcium deficiency disorder./
Author:	Chang, Yao-Chien.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2002,
Description:	177 p.
Notes:	Source: Dissertations Abstracts International, Volume: 64-06, Section: B.
Contained By:	Dissertations Abstracts International64-06B.
Subject:	Botany. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3063670
ISBN:	9780493825090

Upper leaf necrosis on Lilium cv. Star Gazer: A calcium deficiency disorder.
Chang, Yao-Chien.

Upper leaf necrosis on Lilium cv. Star Gazer: A calcium deficiency disorder. - Ann Arbor : ProQuest Dissertations & Theses, 2002 - 177 p.

Source: Dissertations Abstracts International, Volume: 64-06, Section: B.

Thesis (Ph.D.)--Cornell University, 2002.

This item must not be sold to any third party vendors.

A necrotic disorder that we termed "upper leaf necrosis" (ULN) occurs on the upper leaves of Lilium cv. Star Gazer. The disorder resembles calcium (Ca) deficiency of other crops, so we hypothesized it was a Ca deficiency disorder. We acquired the following data to support this hypothesis: (1) The Ca concentration in necrosed tissue was only 0.10% (w/w), much less than that in healthy tissue (0.57%). Leaf Ca concentration was negatively correlated with necrosed area. (2) By using Ca-free nutrient solution in sand cultures with smaller bulbs that are not normally susceptible, we were able to reproduce the symptoms of ULN. (3) Supplying supplemental Ca directly to young leaves significantly reduced ULN severity. ULN occurred only on upper leaves. It was initially characterized by depressed regions on lower leaf surface or water-soaked tissues, that often led to leaf curling, distortion, or tip death. For plants grown from bulbs 16/18 cm circumference, most began to show symptoms 30-40 days after planting. At this stage, plants were in the rapid growth phase, with a height of 32 cm, and 6 leaves immediately below flower buds remaining to unfold. ULN was primarily caused by insufficient Ca supply from the bulb. While the bulb did export Ca to the shoot, the amount was limited. Accordingly, symptoms appeared on the upper, young leaves. Leaf overlap (enclosure), which reduced the transpiration of young leaves, is an important factor that encouraged the occurrence of ULN. By manually unfolding leaves, transpiration of young upper leaves was increased, and ULN was prevented. Plants grown from large bulbs (>16 cm) were much more susceptible, a more enclosed shoot apex might be the major cause. Low light intensity reduced transpiration, and led to a more severe ULN. Mist also increased the risk of ULN. Foliar Ca sprays significantly reduced the severity of ULN; fourteen daily sprays of 25 mM calcium chloride or calcium nitrate were both effective. Using overhead fans to increase air flow on the tops of plants significantly reduced both incidence and severity, offering another promising method to control this disorder.

ISBN: 9780493825090Subjects--Topical Terms:

516217
Botany.

Upper leaf necrosis on Lilium cv. Star Gazer: A calcium deficiency disorder.
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520 $a A necrotic disorder that we termed "upper leaf necrosis" (ULN) occurs on the upper leaves of Lilium cv. Star Gazer. The disorder resembles calcium (Ca) deficiency of other crops, so we hypothesized it was a Ca deficiency disorder. We acquired the following data to support this hypothesis: (1) The Ca concentration in necrosed tissue was only 0.10% (w/w), much less than that in healthy tissue (0.57%). Leaf Ca concentration was negatively correlated with necrosed area. (2) By using Ca-free nutrient solution in sand cultures with smaller bulbs that are not normally susceptible, we were able to reproduce the symptoms of ULN. (3) Supplying supplemental Ca directly to young leaves significantly reduced ULN severity. ULN occurred only on upper leaves. It was initially characterized by depressed regions on lower leaf surface or water-soaked tissues, that often led to leaf curling, distortion, or tip death. For plants grown from bulbs 16/18 cm circumference, most began to show symptoms 30-40 days after planting. At this stage, plants were in the rapid growth phase, with a height of 32 cm, and 6 leaves immediately below flower buds remaining to unfold. ULN was primarily caused by insufficient Ca supply from the bulb. While the bulb did export Ca to the shoot, the amount was limited. Accordingly, symptoms appeared on the upper, young leaves. Leaf overlap (enclosure), which reduced the transpiration of young leaves, is an important factor that encouraged the occurrence of ULN. By manually unfolding leaves, transpiration of young upper leaves was increased, and ULN was prevented. Plants grown from large bulbs (>16 cm) were much more susceptible, a more enclosed shoot apex might be the major cause. Low light intensity reduced transpiration, and led to a more severe ULN. Mist also increased the risk of ULN. Foliar Ca sprays significantly reduced the severity of ULN; fourteen daily sprays of 25 mM calcium chloride or calcium nitrate were both effective. Using overhead fans to increase air flow on the tops of plants significantly reduced both incidence and severity, offering another promising method to control this disorder.
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